Vic police vow AFL grand final crackdown

AFL grand final revellers are being warned to behave, with police promising a blitz in Melbourne's CBD and on the state's roads on Saturday.

Hundreds of officers will target drink driving across the state and will also patrol the Melbourne Cricket Ground, live match-screening sites and the CBD streets on foot to curb unruly behaviour.

Assistant Commissioner Robert Hill says police will use marked and unmarked vehicles, booze and drug buses, and number plate recognition equipment to crack down on drivers who shouldn't be on the road.

"Sometimes you'll know we're there, sometimes you won't," he said in a statement on Friday.

Mr Hill urged anyone who plans to sink a few drinks - whether to celebrate or commiserate over the game's result - to plan in advance how they were getting home.

"It could save your life," he said.

Melbourne Divisional Superintendent Rod Wilson said any troublemakers at Saturday's clash between Hawthorn and Sydney could face arrest, ejection and on-the-spot fines of up to $704.

A capacity 98,000-strong crowd is expected to pack the MCG for the clash, and police have urged people to be patient and to allow extra travel time.